DIAGNOSTIC MANUAL
15.2. ENTRY CONDITIONS
Overview
A Regen may not occur due to any of the following conditions:
•
Inhibitors do not match their expected value
•
Entry conditions have not been met
•
Active fault code(s)
To view the status of Regen inhibitors, use an Electronic Service Tool (EST) with ServiceMaxx™ software, go
to Tests > KOER Aftertreatment Tests > Onboard Filter Cleanliness Test. Select the Inhibitors tab.
NOTE – Any active aftertreatment system fault code(s) may inhibit a Regen. Diagnose active fault code(s)
before continuing (see Electronic Control Systems Diagnostics” in Engine Diagnostic Manual)
Table 185
Entry Conditions for an Active Regen
When the ECM determines the soot level threshold is reached, the system triggers DPF Regen.
NOTE – Short trips or stop and go driving could prevent a successful Regen.
The following conditions are required for an Active Regen:
•
DPF Status signal displaying: Regen Needed
•
Red stop engine lamp not on
•
Engine Coolant Temperature is above or at least 170ºF (75ºC)
•
Inhibiting DTCs must not be active
•
Regen Inhibit switch not active (switch must be off)
•
PTO not active (switch must be off)
•
Exhaust Temperature sensors below safe thresholds:
•
DOCIT below 932°F (500°C)
•
DOCOT below 120°F (650°C)
•
DPFOT below 1382°F (750°C)
If DPF Status displays Regen needed and vehicle is unable to perform an Active Regen, go to appropriate
aftertreatment system diagnostics section in this manual.
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